//////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 27129 SUBJECT: LIGO/Virgo S200219ac: Global MASTER-Net observations report DATE: 20/02/19 12:49:23 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs V. Lipunov, E. Gorbovskoy, V.Kornilov, N.Tyurina, P.Balanutsa, A.Kuznetsov, F.Balakin, V.Vladimirov, D. Vlasenko, I.Gorbunov, D.Zimnukhov, V.Senik, T.Pogrosheva, D.Kuvshinov, D. Cheryasov (Lomonosov Moscow State University, SAI, Physics Department), R. Podesta, C.Lopez, F. Podesta, C.Francile (Observatorio Astronomico Felix Aguilar OAFA), H.Levato (Instituto de Ciencias Astronomicas, de la Tierra y del Espacio ICATE), R. Rebolo, M. Serra (The Instituto de Astrofisica de Canarias), D. Buckley (South African Astronomical Observatory), O.A. Gres, N.M. Budnev, O.Ershova (Irkutsk State University, API), A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory), V. Yurkov, A. Gabovich, Yu. Sergienko (Blagoveschensk Educational State University) MASTER-Amur robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Russia (Blagoveshchensk State Pedagogical University) started inspect of the LIGO/Virgo S200219ac errorbox 101 sec after notice time and 9677 sec after trigger time at 2020-02-19 12:25:32 UT, with upper limit up to 17.2 mag. The observations began at zenith distance = 53 deg. The sun altitude is -34.0 deg. The galactic latitude b = -84 deg., longitude l = 224 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/ligo_1.php?id=11346 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 9707 | 2020-02-19 12:25:32 | MASTER-Amur | (12h 46m 13.37s , +51d 52m 37.4s) | C | 60 | 17.2 | 9787 | 2020-02-19 12:26:51 | MASTER-Amur | (12h 46m 13.51s , +51d 53m 32.6s) | C | 60 | 17.2 | 9866 | 2020-02-19 12:28:11 | MASTER-Amur | (12h 46m 20.20s , +51d 52m 30.7s) | C | 60 | 17.1 | Filter C is a clear (unfiltred) band. The observation and reduction will continue. The message may be cited. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 27130 SUBJECT: LIGO/Virgo S200219ac: Identification of a GW compact binary merger candidate DATE: 20/02/19 12:53:35 GMT FROM: Sarah Antier at APC The LIGO Scientific Collaboration and the Virgo Collaboration report: We identified the compact binary merger candidate S200219ac during real-time processing of data from LIGO Hanford Observatory (H1), LIGO Livingston Observatory (L1), and Virgo Observatory (V1) at 2020-02-19 09:44:15.195 UTC (GPS time: 1266140673.195). The candidate was found by the PyCBC Live [1], CWB [2], MBTAOnline [3], SPIIR [4], and GstLAL [5] analysis pipelines. The delay in issuing the alert was due to a software issue in the online system. S200219ac is an event of interest because its false alarm rate, as estimated by the online analysis, is 1.3e-08 Hz, or about one in 2 years. The event's properties can be found at this URL: https://gracedb.ligo.org/superevents/S200219ac The classification of the GW signal, in order of descending probability, is BBH (96%), Terrestrial (4%), BNS (<1%), NSBH (<1%) or MassGap (<1%). Assuming the candidate is astrophysical in origin, the probability that the lighter compact object has a mass < 3 solar masses (HasNS) is <1%. Using the masses and spins inferred from the signal, the probability of matter outside the final compact object (HasRemnant) is <1%. One sky map is available at this time and can be retrieved from the GraceDB event page:   * bayestar.fits.gz, an updated localization generated by BAYESTAR [6], distributed via GCN notice about 2 hours after the candidate. The preferred sky map at this time is bayestar.fits.gz. For the bayestar.fits.gz sky map, the 90% credible region is 1251 deg2. Marginalized over the whole sky, the a posteriori luminosity distance estimate is 1510 +/- 405 Mpc (a posteriori mean +/- standard deviation). For further information about analysis methodology and the contents of this alert, refer to the LIGO/Virgo Public Alerts User Guide .  [1] Nitz et al. PRD 98, 024050 (2018)  [2] Klimenko et al. PRD 93, 042004 (2016)  [3] Adams et al. CQG 33, 175012 (2016)  [4] Qi Chu, PhD Thesis, The University of Western Australia (2017)  [5] Messick et al. PRD 95, 042001 (2017)  [6] Singer & Price PRD 93, 024013 (2016) //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 27131 SUBJECT: LIGO/Virgo S200219ac: No counterpart candidates in INTEGRAL SPI-ACS and IBIS prompt observation DATE: 20/02/19 13:23:51 GMT FROM: Maeve Doyle at U College Dublin, Ireland M. Doyle (UCD, Ireland) V. Savchenko, C. Ferrigno (ISDC/UniGE, Switzerland) J. Rodi (IAPS-Roma, Italy) A. Coleiro (APC, France) S. Mereghetti (INAF IASF-Milano, Italy) on behalf of the INTEGRAL multi-messenger collaboration: https://www.astro.unige.ch/cdci/integral-multimessenger-collaboration Using combination of INTEGRAL all-sky detectors (following [1]): SPI/ACS, IBIS/Veto, and IBIS we have performed a search for a prompt gamma-ray counterpart of S200219ac (GCN 27130). At the time of the event (2020-02-19 09:44:15 UTC, hereafter T0), INTEGRAL was operating in nominal mode. The peak of the event localization probability was at an angle of 95 deg with respect to the spacecraft pointing axis. This orientation implies strongly suppressed (6.9% of optimal) response of ISGRI, strongly suppressed (32% of optimal) response of IBIS/Veto, and near-optimal (69% of optimal) response of SPI-ACS. The background within +/-300 seconds around the event was very stable (excess variance 1.2). We have performed a search for any impulsive events in INTEGRAL SPI- ACS (as described in [2]), IBIS, and IBIS/Veto data. We do not detect any significant counterparts and estimate a 3-sigma upper limit on the 75-2000 keV fluence of 2.4e-07 erg/cm^2 (within the 50% probability containment region of the source localization) for a burst lasting less than 1 s with a characteristic short GRB spectrum (an exponentially cut off power law with alpha=-0.5 and Ep=600 keV) occurring at any time in the interval within 300 s around T0. For a typical long GRB spectrum (Band function with alpha=-1, beta=-2.5, and Ep=300 keV), the derived peak flux upper limit is ~2.1e-07 (6.2e-08) erg/cm^2/s at 1 s (8 s) time scale in 75-2000 keV energy range. For the mean reported distance 1510.0 Mpc this corresponds to the limit on the total isotropic equivalent energy in 1 s of 6.6e+49 erg for the short GRB spectrum and for a long GRB spectrum isotropic equivalent luminosity in 1 s (8 s) of 4.5e+49 erg/s (1.7e+49 erg/s) We report for completeness and in order of FAP, all excesses identified in the search region. We find 5 likely background excesses: T-T0 | scale | S/N | luminosity ( x 1e+50 erg/s) | FAP -83.5 | 0.5 | 4 | 13 +/- 3.74 +/- 6.35 | 0.555 90 | 1.4 | 3.2 | 6.28 +/- 2.23 +/- 3.08 | 0.836 17.1 | 0.4 | 3 | 10.9 +/- 4.18 +/- 5.35 | 0.902 -164 | 0.7 | 3.8 | 10.6 +/- 3.16 +/- 5.17 | 0.912 -81.2 | 0.4 | 3.7 | 13.3 +/- 4.18 +/- 6.5 | 0.939 Note that FAP estimates (especially at timescales above 2s) may be possibly further affected by enhanced non-stationary local background noise. This list excludes any excesses for which FAP is close to unity. All results quoted are preliminary. This circular is an official product of the INTEGRAL Multi-Messenger team. [1] Savchenko et al. 2017, A&A 603, A46 [2] Savchenko et al. 2012, A&A 541A, 122S //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 27132 SUBJECT: LIGO/Virgo S200219ac: Coverage and upper limits from MAXI/GSC observations DATE: 20/02/19 13:35:02 GMT FROM: Satoshi Sugita at Aoyama Gakuin U. S. Sugita, M. Serino (AGU), N. Kawai (Tokyo Tech), H. Negoro (Nihon U.), M. Nakajima, W. Maruyama, M. Aoki, K. Kobayashi, R. Takagi (Nihon U.), T. Mihara, C. Guo, Y. Zhou, T. Tamagawa, M. Matsuoka (RIKEN), T. Sakamoto, H. Nishida, A. Yoshida (AGU), Y. Tsuboi, W. Iwakiri, R. Sasaki, H. Kawai, T. Sato (Chuo U.), M. Shidatsu (Ehime U.), M. Oeda, K. Shiraishi (Tokyo Tech), S. Nakahira, Y. Sugawara, S. Ueno, H. Tomida, M. Ishikawa, R. Shimomukai, M. Tominaga (JAXA), Y. Ueda, A. Tanimoto, S. Yamada, S. Ogawa, K. Setoguchi, T. Yoshitake (Kyoto U.), H. Tsunemi, T. Yoneyama, K. Asakura, S. Ide (Osaka U.), M. Yamauchi, S. Iwahori, Y. Kurihara, K. Kurogi, K. Miike (Miyazaki U.), T. Kawamuro (NAOJ), K. Yamaoka (Nagoya U.), Y. Kawakubo (LSU), M. Sugizaki (NAOC) report on behalf of the MAXI team: We examined MAXI/GSC all-sky X-ray images (2-20 keV) after the LVC trigger S200219ac at 2020-02-19 09:44:15.195 UTC (GCN 27130). At the trigger time of S200219ac, the high-voltage of MAXI/GSC was off, and it was turned on at T0+611 sec (+10.2 min). The first one-orbit (92 min) scan observation with GSC after the event covered 91% of the 90% credible region of the bayestar skymap from 09:54:27 to 11:04:42 UTC (T0+612 to T0+4827 sec). No significant new source was found in the region in the one-orbit scan observation. A typical 1-sigma averaged upper limit obtained in one scan observation is 20 mCrab at 2-20 keV. If you require information about X-ray flux by MAXI/GSC at specific coordinates, please contact the submitter of this circular by email. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 27133 SUBJECT: LIGO/Virgo S200219ac: No counterpart candidates in HAWC observations DATE: 20/02/19 13:52:20 GMT FROM: Hugo Ayala at Pennsylvania State University The HAWC Collaboration (https://www.hawc-observatory.org) reports: The HAWC Collaboration performed a follow-up of the gravitational wave trigger S200219ac. At the time of the trigger the HAWC local zenith was oriented towards (RA, Dec) = (197.3deg, 19.1deg). 43% of the GW candidate sky location probability fell within our observable field of view (0-45 deg zenith angle). We performed a search for a short timescale emission using 6 sliding time windows (dt = 0.3s, 1s, 3s, 10s, 30s and 100s), shifted forward in time by 20% of their width. We searched the 95% probability containment area in a timescale-dependent time period, from t0-5dt to t0+10dt, where t0 is the time of the GW trigger. No significant gamma-ray detection above the background was observed. The sensitivity of this analysis is greatly dependent on zenith angle, ranging from 20.3deg to 45.0deg for the area searched in this analysis. The 5sigma detection sensitivity to a 1s (100s) burst in the 80-800GeV energy range goes from 2.3e-06 erg/cm^2 to 1.1e-04 erg/cm^2 (1.3e-05 erg/cm^2 to 5.0e-04 erg/cm^2), depending on the zenith angle. HAWC is a TeV gamma ray water Cherenkov array located in the state of Puebla, Mexico. It is sensitive to the energy range ~0.1-100TeV, and monitors 2/3 of the sky every day with an instantaneous field-of-view of ~2 sr. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 27134 SUBJECT: LIGO/Virgo S200219ac: Upper limits from IceCube neutrino searches DATE: 20/02/19 13:53:49 GMT FROM: Raamis Hussain at IceCube IceCube Collaboration (http://icecube.wisc.edu/) reports: Searches [1,2] for track-like muon neutrino events detected by IceCube consistent with the sky localization of gravitational-wave candidate S200219ac in a time range of 1000 seconds [3] centered on the alert event time (2020-02-19 09:35:55.195 UTC to 2020-02-19 09:52:35.195 UTC) have been performed. During this time period IceCube was collecting good quality data. No significant track-like events are found in spatial coincidence of S200219ac calculated from the map circulated in the 2-Initial notice. IceCube's sensitivity assuming an E^-2 spectrum (E^2 dN/dE) to neutrino point sources within the locations spanned by the 90% spatial containment of S200219ac ranges from 0.030 to 0.732 GeV cm^-2 in a 1000 second time window. The IceCube Neutrino Observatory is a cubic-kilometer neutrino detector operating at the geographic South Pole, Antarctica. The IceCube realtime alert point of contact can be reached at roc@icecube.wisc.edu [1] Bartos et al. arXiv:1810.11467 (2018) and Countryman et al.arXiv:1901.05486 (2019) [2] PoS(ICRC2019)918 and Braun et al., Astroparticle Physics 29, 299 (2008) [3] Baret et al., Astroparticle Physics 35, 1 (2011) //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 27135 SUBJECT: LIGO/Virgo S200219ac : no neutrino counterpart candidate in ANTARES search DATE: 20/02/19 14:03:51 GMT FROM: Thierry Pradier at ANTARES/IPHC/U of Strasbourg M. Ageron (CPPM/CNRS), B. Baret (APC/CNRS), A. Coleiro (APC/Universite de Paris), M. Colomer (APC/Universite de Paris), D. Dornic (CPPM/CNRS), A. Kouchner (APC/Universite de Paris), T. Pradier (IPHC/Universite de Strasbourg) report on behalf of the ANTARES Collaboration: Using on-line data from the ANTARES detector, we have performed a follow-up analysis of the recently reported LIGO/Virgo S200219ac event using the 90% contour of the Initial Bayestar probability map provided by the GW interferometers (GCN#27130 ). The ANTARES visibility at the time of the alert, together with the 50% and 90% contours of the probability map are shown at http://antares.in2p3.fr/GW/S200219ac_Initial.png . Considering the location probability provided by the LIGO/Virgo collaborations, there is a 55.5% chance that the GW emitter was in the ANTARES **upgoing** field of view at the time of the alert. No up-going muon neutrino candidate events were recorded in the ANTARES sky during a +/-500s time-window centered on the time 2020-02-19 09:44:15 and in the 90% contour of the S200219ac event. The expected number of atmospheric background events in the region visible by ANTARES is 3.87e-04 in the +/- 500s time window. An extended search during +/- 1 hour gives no up-going muon neutrino coincidence. The expected number of atmospheric background events in the region visible by ANTARES is 2.79e-03 in this larger time window. ANTARES is the largest undersea neutrino detector, installed in the Mediterranean Sea, and it is primarily sensitive to neutrinos in the TeV-PeV energy range. At 10 TeV, the median angular resolution for muon neutrinos is about 0.5 degrees. In the range 1-100 TeV ANTARES has a competitive sensitivity to this position in the sky. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 27136 SUBJECT: LIGO/Virgo S200219ac: upper limits from AGILE/MCAL observations DATE: 20/02/19 16:27:13 GMT FROM: Alessandro Ursi at INAF/IAPS A. Ursi (INAF/IAPS), F. Verrecchia (SSDC, and INAF/OAR), M. Tavani (INAF/IAPS, and Univ. Roma Tor Vergata), M. Cardillo, C. Casentini, G. Piano (INAF/IAPS), F. Lucarelli, C. Pittori (SSDC, and INAF/OAR), A. Bulgarelli, V. Fioretti, N. Parmiggiani (INAF/OAS-Bologna), M. Pilia (INAF/OA-Cagliari), F. Longo (Univ. Trieste, and INFN Trieste), report on behalf of the AGILE Team: In response to the LIGO/Virgo GW event S200219ac at T0 = 2020-02-19 09:44:15.195 (UT), a preliminary analysis of the AGILE minicalorimeter (MCAL) triggered data found no significant event candidates within a time interval covering -/+ 15 sec from the LIGO/Virgo T0. At the T0, about 60% of the S200219ac 90% c.l. localization region was accessible to the AGILE MCAL. Three-sigma upper limits (ULs) are obtained for a 1 s integration time at different celestial positions within the accessible S200219ac localization region, from a minimum of 1.6E-06 erg cm^-2 to a maximum of 7.2E-06 erg cm^-2 (assuming as spectral model a single power law with photon index 1.5). An independent procedure based on photon counting statistics provides UL fluences in the range 0.4-1 MeV, for a 300 µs integration time, from a minimum of 1.4E-8 erg cm^-2 to a maximum of 4.4E-8 erg cm^-2. The AGILE-MCAL detector is a CsI detector with a 4 pi FoV, sensitive in the energy range 0.4-100 MeV. Additional analysis of AGILE data is in progress. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 27141 SUBJECT: LIGO/Virgo S200219ac: upper limits from AGILE/GRID observations DATE: 20/02/19 17:42:29 GMT FROM: Francesco Verrecchia at SSDC,INAF-OAR F. Verrecchia (SSDC, and INAF/OAR), A. Ursi (INAF/IAPS), M. Tavani (INAF/IAPS, and Univ. Roma Tor Vergata), M. Cardillo, C. Casentini, G. Piano (INAF/IAPS), F. Lucarelli, C. Pittori (SSDC, and INAF/OAR), A. Bulgarelli, V. Fioretti, N. Parmiggiani (INAF/OAS-Bologna), M. Pilia (INAF/OA-Cagliari), F. Longo (Univ. Trieste, and INFN Trieste), report on behalf of the AGILE Team: In response to the LIGO-Virgo GW event S200219ac at T0 = 2020-02-19 09:44:15.195 UTC a preliminary analysis of the AGILE exposure at T0 shows that the Gamma-Ray Imaging Detector (GRID) exposure covered less than 10% of the 90% c.l. localization region (LR; 40% of the LR is occulted by Earth). We performed an analysis of the GRID data in the energy range 50 MeV - 10 GeV at T0, where good exposure of the S200219ac 90% c.l. LR was available. No candidate gamma-ray transient was detected. The following preliminary GRID values of 3-sigma upper limit (UL) are obtained: from 1.7e-06 to 9.6e-06 erg cm^-2 s^-1, with exposure of about 14% of the LR over the time interval (T0 s ; T0 + 10 s); from 3.8e-08 to 2.0e-06 erg cm^-2 s^-1, with exposure of about 48% of the LR over the time interval (T0 s ; T0 + 100 s); These measurements were obtained with AGILE observing a large portion of the sky in spinning mode. Additional analysis of AGILE data is in progress. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 27143 SUBJECT: LIGO/Virgo S200219ac: No counterpart candidates in Fermi-LAT observations DATE: 20/02/19 20:58:12 GMT FROM: Feraol Dirirsa at U of Johannesburg/Fermi-LAT F. Dirirsa (Univ. of Johannesburg), M. Axelsson (KTH & Stockholm Univ), E. Bissaldi (Politecnico & INFN Bari), D. Kocevski (NASA/MSFC), N. Omodei (Stanford Univ.), N. Di Lalla (Stanford Univ.) and F.Longo (University and INFN, Trieste) report on behalf of the Fermi-LAT Collaboration: We have searched data collected by the Fermi Large Area Telescope (LAT) on February 19, 2020, for possible high-energy (E > 100 MeV) gamma-ray emission in spatial/temporal coincidence with the LIGO/Virgo trigger S200219ac (GCN 27130). We define "instantaneous coverage" as the integral over the region of the LIGO probability map that is within the LAT field of view at a given time, and "cumulative coverage" as the integral of the instantaneous coverage over time. Fermi-LAT had no coverage at the time of the trigger (T0 = 2020-02-19 09:44:15.195 UTC), and reached 87% cumulative coverage after ~2.5 ks. The remaining region was not observed within 10 ks following the trigger time of the event. We performed a search for a transient counterpart within the observed region of the 90% contour of LIGO map in a fixed time window from T0 to T0 + 10 ks. No significant new sources are found. We also performed a search which adapted the time interval of the analysis to the the exposure of each region of the sky, and no additional excesses were found. Energy flux upper bounds for the fixed time interval between 100 MeV and 1 GeV for this search vary between 1.4e-10 and 7.8e-08 [erg/cm^2/s]. The Fermi-LAT point of contact for this event is Feraol Dirirsa (fdirirsa@uj.ac.za). The Fermi-LAT is a pair conversion telescope designed to cover the energy band from 20 MeV to greater than 300 GeV. It is the product of an international collaboration between NASA and DOE in the U.S. and many scientific institutions across France, Italy, Japan and Sweden. ________________________________ This email and all contents are subject to the following disclaimer: http://disclaimer.uj.ac.za //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 27144 SUBJECT: LIGO/Virgo S200219ac: Fermi GBM transient event not confidently associated with GW signal DATE: 20/02/19 21:57:24 GMT FROM: Rachel Hamburg at UAH R. Hamburg (UAH) reports on behalf of the Fermi-GBM Team: For S200219ac and using the initial BAYESTAR skymap, Fermi-GBM was observing 46.6% of the localization probability at event time; the southern lobe was Earth-occulted for GBM. There was a Fermi-GBM onboard trigger, GRB 200219B (GCN 27127), approximately 10 min after the LIGO/Virgo detection of the GW trigger (GCN 27130). However due to the temporal offset and spatial inconsistency, we do not consider these two events associated. An automated, blind search for short gamma-ray bursts below the onboard triggering threshold in Fermi-GBM also identified no counterpart candidates +/- 1 hour around the GW event time. The GBM targeted search, the most sensitive, coherent search for GRB-like signals, was run from +/-30 s around merger time for S200219ac. The targeted search identified a transient at approximately T0+11 s that is consistent with a short GRB origin and spatially consistent with the initial S200219ac localization map. The SNR of this event is 5.6, and the False Alarm Rate for signals of this significance in GBM data is 3.0E-4 Hz. However, due to the weak nature of the event, the rate of events of similar significance in GBM, and the presence of multiple galactic transient signals around the time of interest, we are not confident in an association. For the interested observer, the GBM localization HEALPix file can be found on the Gravitational Wave Treasure Map (Wyatt et al. 2020, arXiv:2001.00588) at: http://treasuremap.space/static/S200219ac_GBM_Event1_healpix.fit. The skymap image can be found at: http://treasuremap.space/static/S200219ac_GBM_Event1_skymap.png. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 27147 SUBJECT: LIGO/Virgo S200219ac: no counterpart candidates in the Swift/BAT observations DATE: 20/02/20 01:16:16 GMT FROM: Amy Lien at GSFC T. Sakamoto (AGU), S. D. Barthelmy (NASA/GSFC), A. Y. Lien (GSFC/UMBC), D. M. Palmer (LANL) A. P. Beardmore (U. Leicester), M. G. Bernardini (INAF-OAB), A. A. Breeveld (MSSL-UCL), D. N. Burrows (PSU), S. Campana (INAF-OAB), S. B. Cenko (NASA/GSFC), G. Cusumano (INAF-IASF PA), A. D'Ai (INAF-IASFPA), P. D'Avanzo (INAF-OAB), V. D'Elia (ASI-ASDC), S. Emery (UCL-MSSL), P. A. Evans (U. Leicester), P. Giommi (ASI), C. Gronwall (PSU), D. Hartmann (Clemson U.), J. A. Kennea (PSU), N. Klingler (PSU), H. A. Krimm (NSF), N. P. M. Kuin (UCL-MSSL), F. E. Marshall (NASA/GSFC), A. Melandri (INAF-OAB), J. A. Nousek (PSU), S. R. Oates (U. of Birmingham), P. T. O'Brien (U. Leicester), J. P. Osborne (U. Leicester), C. Pagani (U. Leicester), K. L. Page (U.Leicester), M. J. Page (UCL-MSSL), M. Perri (ASDC), J. L. Racusin (NASA/GSFC), B. Sbarufatti (INAF-OAB/PSU), M. H. Siegel (PSU), G. Tagliaferri (INAF-OAB), A. Tohuvavohu (U. Toronto), E. Troja (NASA/GSFC/UMCP) report on behalf of the Swift team: We report the search results in the BAT data within T0 +/- 100 s of the LVC event S200219ac (LIGO/VIRGO Collaboration GCN Circ. 27130), where T0 is the LVC trigger time (2020-02-19T09:44:15.195 UTC). The center of the BAT field of view (FOV) at T0 is RA = 342.701 deg, DEC = -59.111 deg, and the roll angle is 346.271 deg. The BAT FOV (>10% partial coding) covers 47.80% of the integrated LVC localization probability, and 47.45% of the galaxy convolved probability (Evans et al. 2016). Note that the sensitivity in the BAT FOV changes with the partial coding fraction. Please see the BAT FOV figure in the summary page (link below) for the specific location of the LVC region relative to the BAT FOV. Within T0 +/- 100 s, no significant detections (signal-to-noise ratio >~ 5 sigma) are found in the BAT raw light curves with time bins of 64 ms, 1 s, and 1.6 s. Also, there is no significant signal in BAT around the time of the GBM signal at ~T0+11 (Hamburg et al. GCN Circ. 27144). Assuming an on-axis (100% coded) short GRB with a typical spectrum in the BAT energy range (i.e., a simple power-law model with a power-law index of -1.32, Lien & Sakamoto et al. 2016), the 5-sigma upper limit in the 1-s binned light curve corresponds to a flux upper limit (15-350 keV) of ~ 1.05 x 10^-7 erg/s/cm^2. Assuming a luminosity of ~ 2 x 10^47 erg/s (similar to GW170817) and an average Epeak of ~ 400 keV for short GRBs (Bhat et al. 2016), this flux upper limit corresponds to a distance of ~ 70.29 Mpc. No event data are available in T0 +/- 100 s. The event data collected via the GUANO system (Tohuvavohu et al. 2020, in prep) weren't available due to the delay of notice. BAT retains decreased, but significant, sensitivity to rate increases for gamma-ray events outside of its FOV. About 23.36% of the integrated LVC localization probability was outside of the BAT FOV but above the Earth's limb from Swift's location, and the corresponding flux upper limits for this region are within roughly an order of magnitude higher than those within the FOV. The results of the BAT analysis are available at https://swift.gsfc.nasa.gov/results/BATbursts/team_web/S200219ac/web/source_public.html //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 27149 SUBJECT: LIGO/Virgo S200219ac: No transient candidates in CALET observations DATE: 20/02/20 04:51:24 GMT FROM: Yuta Kawakubo at Louisiana State U./CALET V. Pal'shin, A. Yoshida, T. Sakamoto, S. Sugita (AGU), Y. Kawakubo (LSU), K. Yamaoka (Nagoya U), S. Nakahira (RIKEN), Y. Asaoka, S. Torii (Waseda U), Y. Shimizu, T. Tamura (Kanagawa U), N. Cannady (GSFC/UMBC), M. L. Cherry (LSU), S. Ricciarini (U of Florence), P. S. Marrocchesi (U of Siena), and the CALET collaboration: The CALET Gamma-ray Burst Monitor (CGBM) was operating at the trigger time of S200219ac T0 = 2020-02-19 09:44:15.195 UT (The LIGO Scientific Collaboration and Virgo Collaboration, GCN Circ. 27130). No CGBM on-board trigger occurred around the event time. Based on the LVC high probability localization region, the summed LIGO probabilities inside the CGBM HXM (7 - 3000 keV) and SGM (40 keV - 28 MeV) fields of view are 23 % and 48 %, respectively (and 73 % credible region of the updated localization map was above the horizon). The HXM and SGM fields of view were centered at RA = 294.7 deg, Dec = +61.4 deg and RA =298.3 deg, Dec = +51.6 deg at T0, respectively. Based on the analysis of the light curve data with 0.125 sec time resolution from T0-60 sec to T0+60 sec, we found no significant excess (signal-to-noise ratio >= 7) around the trigger time in either the HXM or the SGM data. The CALET Calorimeter (CAL) was operating in the high energy trigger mode at the trigger time of S200219ac. Using the CAL data, we have searched for gamma-ray events in the 10-100 GeV band from -60 sec to +60 sec from the GW trigger time and found no candidates. There was no significant overlap with the LVC high probability localization region at T0+-60 sec. The CAL FOV was centered at RA = 298.5 deg, Dec = +51.6 deg at T0. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 27160 SUBJECT: LIGO/Virgo S200219ac: No counterpart candidates in KAIT observations DATE: 20/02/21 05:14:25 GMT FROM: Weikang Zheng at UC Berkeley Sergiy Vasylyev, Yukei Murakami, Keto D. Zhang, WeiKang Zheng, and Alexei V. Filippenko (UC Berkeley) report on behalf of the Lick/KAIT GW follow-up team: The 0.76-m Katzman Automatic Imaging Telescope (KAIT), located at Lick Observatory, observed the 90% region of the gravitational-wave event S200219ac (GCN 27130) detected by LIGO/Virgo. More than one thousand galaxies were selected from the Glade catalog V1.0 (Dalya et al., 2018, MNRAS, 479, 2374; http://aquarius.elte.hu/glade/) according to their priority score. KAIT observed 171 of them based on their priority scores and elevation visibility, with each clear-filter exposure time being 60 s. The first image was taken at 05:57:00, Feb. 20th UT, about 20.2 hours after the trigger, and the last image at 11:25:04 UT. Our typical limiting mag is 19.0. No viable counterparts were identified and the analysis is ongoing. A full list of galaxies observed by KAIT is given below. GladeID UT(Feb20) RA_J2000 Dec_J2000 ----------------------------------------------- G0799947 05:57:00 10:53:50.2514 +16:51:02.2464 G0649933 05:58:17 11:08:43.374 +29:13:26.0544 G0735397 05:59:28 11:10:24.906 +28:42:29.7396 G0587168 06:00:37 11:11:09.6276 +32:26:25.3392 G0584961 06:01:46 11:12:06.7054 +30:40:41.2572 G0599663 06:02:58 11:12:11.3525 +30:43:52.2696 G0559035 06:04:07 11:12:50.658 +30:03:32.7348 G0655611 06:05:16 11:12:53.8915 +28:48:42.9804 G1190111 06:06:27 11:14:36.7382 +31:49:26.742 G0643832 06:07:37 11:15:13.1945 +29:16:15.888 G0712497 06:08:46 11:15:28.5974 +31:47:56.1444 G0576641 06:09:57 11:15:29.3518 +35:10:56.1324 G0717203 06:12:18 11:17:14.4067 +29:31:13.9872 G0825338 06:13:29 11:17:51.8957 +36:07:23.808 G0688170 06:14:39 11:18:21.936 +32:43:19.5852 G0429937 06:15:48 11:18:25.3968 +31:24:39.5784 G0686309 06:16:57 11:18:59.381 +27:54:07.0092 G0661792 06:18:07 11:19:34.5667 +29:10:59.3364 G1447142 06:19:16 11:19:40.0709 +31:14:47.2164 G0707521 06:20:25 11:19:56.4845 +29:47:37.0788 G0630891 06:21:37 11:20:22.4194 +35:04:15.8448 G0803255 06:22:46 11:20:27.1217 +35:47:06.8496 G0607406 06:23:57 11:20:39.1663 +29:41:22.3044 G1029522 06:26:16 11:21:35.4274 +35:23:24.5076 G1008494 06:27:25 11:21:36.5698 +35:23:14.5068 G0576646 06:28:34 11:21:50.3357 +32:45:53.4636 G1261996 06:29:44 11:21:54.5765 +36:41:48.768 G0564448 06:30:53 11:22:38.2654 +32:43:54.48 G0656201 06:48:55 11:22:56.5027 +34:06:41.508 G0568693 06:50:10 11:23:10.697 +31:12:24.9012 G0645403 06:51:19 11:23:11.4403 +29:35:53.9988 G0678301 06:52:29 11:23:18.6329 +31:40:55.9308 G0484305 06:54:48 11:23:48.131 +30:05:35.8188 G0619705 06:55:57 11:24:39.1517 +32:22:09.0156 G0609884 06:57:07 11:25:08.8512 +33:26:20.4936 G0650045 06:58:18 11:25:24.5434 +31:53:53.9484 G1212973 07:00:37 11:25:49.4604 +36:01:17.9328 G0803244 07:01:47 11:26:04.1638 +35:20:36.0852 G0639433 07:02:57 11:26:52.7417 +36:27:46.3788 G0606379 07:04:06 11:28:41.5942 +38:44:52.3788 G0771638 07:05:15 11:29:02.0654 +34:11:06.8964 G1466571 07:06:25 11:29:09.7082 +36:21:54.9 G0759844 07:07:34 11:29:37.5622 +34:11:58.974 G1328301 07:08:43 11:29:46.692 +31:59:16.4796 G0387004 07:11:02 11:30:03.9403 +36:41:29.5692 G0405129 07:12:11 11:30:06.1488 +35:38:18.5856 G0667795 07:13:23 11:30:08.789 +37:11:23.568 G0873979 07:14:32 11:31:24.3823 +34:30:12.3048 G0943763 07:15:41 11:31:36.3134 +38:47:58.2252 G0513348 07:16:52 11:31:44.1686 +34:32:28.1508 G0559829 07:18:02 11:32:37.9138 +37:34:21.1872 G0843763 07:19:11 11:32:40.7374 +38:52:18.1884 G0877949 07:20:20 11:32:59.2822 +38:55:00.498 G0577120 07:21:30 11:33:17.3657 +38:55:25.3812 G0220960 07:22:39 11:33:39.2102 +36:04:17.4504 G0582149 07:44:35 11:34:10.8106 +31:49:21.0144 G0685324 07:45:46 11:35:28.8355 +36:37:32.3616 G0358128 07:46:56 11:35:43.3961 +33:37:20.4708 G0579900 07:48:07 11:36:11.8397 +38:50:57.4944 G1429004 07:49:16 11:36:40.3822 +32:52:38.4312 G0766814 07:50:28 11:37:17.3803 +42:02:42.9828 G0574437 07:51:38 11:37:24.6715 +39:22:37.884 G0823835 07:52:47 11:38:20.2258 +35:37:21.6228 G1111405 07:53:56 11:38:37.3572 +34:45:44.6184 G0697353 07:55:08 11:38:46.1242 +38:51:34.4376 G0740234 07:56:17 11:39:56.9054 +33:56:28.3884 G0589912 07:57:27 11:41:36.0828 +35:54:45.0648 G0663100 07:58:40 11:41:56.1437 +41:24:38.8008 G0584956 07:59:49 11:44:27.1546 +37:08:31.5636 G1068712 08:01:00 11:47:33.6804 +42:08:39.1596 G0792658 08:02:10 11:48:36.2806 +40:23:21.2388 G0722649 08:03:20 11:55:40.6824 +43:48:40.302 G0612554 08:04:29 11:57:55.7995 +43:49:34.0536 G0781483 08:05:53 12:05:28.4143 +51:28:47.8596 G0701120 08:07:02 12:09:23.2507 +50:56:48.246 G0633275 08:08:13 12:13:49.7863 +55:35:17.5056 G0619306 08:09:23 12:15:11.316 +54:38:01.4748 G0707243 08:12:06 12:18:42.1838 +53:59:49.6608 G0777269 08:13:15 12:21:26.4442 +50:28:06.1536 G0774106 08:14:25 12:21:35.028 +50:27:09.108 G0578847 08:15:34 12:22:52.0423 +54:24:35.9712 G0673609 08:16:43 12:24:51.317 +50:49:39.0108 G0694431 08:17:55 12:25:42.4622 +57:51:58.8672 G0478899 08:19:04 12:25:50.1122 +57:50:35.88 G0619755 08:46:52 12:27:56.3671 +52:31:24.4164 G0822671 08:48:01 12:28:47.3914 +51:15:55.4112 G0701420 08:49:10 12:29:27.1253 +56:06:29.052 G0822038 08:50:20 12:30:04.043 +55:44:36.0096 G0722728 08:51:29 12:30:12.1363 +56:42:07.9812 G0574919 08:52:38 12:30:12.6379 +53:59:37.9716 G0811040 08:53:48 12:30:26.3014 +55:28:09.8328 G0367866 08:54:58 12:31:17.8308 +57:49:48.8172 G0687685 08:56:05 12:31:50.2625 +58:21:28.9296 G0562569 08:58:24 12:33:58.6378 +55:20:20.0328 G0672674 08:59:34 12:34:48.4351 +56:17:39.1776 G0749623 09:00:43 12:34:56.5906 +53:31:54.4764 G1904449 09:01:53 12:35:50.9326 +55:53:44.1312 G0809862 09:03:03 12:35:55.349 +55:56:43.1124 G0643126 09:04:13 12:36:17.6844 +54:42:30.8736 G0696080 09:05:22 12:36:17.8015 +56:54:30.8916 G0608536 09:06:33 12:36:46.333 +55:42:03.078 G0558994 09:07:42 12:37:21.0718 +57:15:22.1364 G1708956 09:08:52 12:37:22.56 +57:15:25.524 G0599908 09:10:03 12:37:58.9306 +55:35:45.4092 G0728556 09:11:12 12:38:15.1171 +53:03:04.4208 G0662281 09:12:22 12:38:38.8037 +55:23:06.3636 G0804583 09:13:31 12:39:11.6234 +53:19:19.704 G0596517 09:14:40 12:39:47.688 +55:46:03.0324 G0777685 09:16:04 12:39:54.3677 +61:12:41.4072 G0571045 09:17:29 12:41:32.1826 +53:52:57.4392 G0583138 09:18:39 12:41:43.3483 +56:47:06.5472 G0571067 09:19:48 12:41:44.557 +56:43:54.534 G0779598 09:21:11 12:42:23.7158 +60:08:04.8696 G0570567 09:49:06 12:42:39.1003 +61:41:09.4524 G0554983 09:50:30 12:43:00.9559 +56:43:50.5956 G0609572 09:51:43 12:43:12.7661 +56:03:27.6408 G0722161 09:53:03 12:43:19.7827 +58:57:53.6148 G1473071 09:54:20 12:43:24.624 +56:38:02.6016 G0575799 09:55:48 12:43:51.599 +62:30:25.9416 G0608648 09:57:16 12:46:17.2486 +56:36:55.0512 G0789419 09:58:27 12:46:30.6775 +57:17:00.096 G0800488 09:59:45 12:46:47.5488 +54:53:15.0432 G0598413 10:00:56 12:47:07.7599 +54:59:18.7188 G0598541 10:02:08 12:47:10.8802 +55:04:40.7424 G0086390 10:03:39 12:47:15.3991 +62:28:53.04 G0819560 10:05:13 12:47:24.2614 +54:59:13.7472 G0783845 10:06:46 12:48:03.0542 +62:36:33.2676 G0617510 10:08:20 12:48:26.9825 +55:27:34.0596 G0810253 10:09:52 12:48:39.9281 +62:37:03.18 G0556824 10:11:11 12:48:40.6054 +59:16:31.71 G0774007 10:12:39 12:48:41.8543 +55:03:44.712 G0701233 10:14:00 12:48:55.3894 +57:57:24.7896 G1437692 10:15:22 12:48:58.385 +55:02:07.7856 G0795970 10:16:39 12:49:09.8364 +56:36:28.764 G0688939 10:17:59 12:49:23.3386 +58:25:15.6612 G0566932 10:19:25 12:49:46.8238 +54:47:51.0972 G0420902 10:20:38 12:49:47.5342 +55:30:49.0968 G0710929 10:22:16 12:51:11.9093 +63:49:57.3708 G0418402 10:23:28 12:52:08.335 +62:53:11.6664 G0793753 10:25:00 12:53:19.032 +57:04:07.302 G0797074 10:26:17 12:53:57.9859 +58:17:38.2164 G0610297 10:27:43 12:54:17.4427 +55:11:51.1188 G0741937 10:29:19 12:54:57.4769 +61:27:10.7568 G0752137 10:50:49 12:55:36.7457 +60:10:57.6552 G0792093 10:52:08 12:55:53.1847 +58:19:49.2852 G1463818 10:53:26 12:55:58.3483 +59:06:51.2316 G0644569 10:54:45 12:55:58.7292 +62:08:48.5952 G0763378 10:56:05 12:56:08.0016 +58:45:23.9364 G0501647 10:57:43 12:56:14.3299 +56:52:24.4236 G0764293 10:59:28 12:56:42.0593 +63:05:15.72 G0820710 11:00:41 12:58:20.7715 +61:30:39.33 G0581776 11:01:56 13:01:00.9706 +59:50:56.4504 G0668949 11:03:14 13:01:50.31 +58:19:35.6736 G0767564 11:04:35 13:02:06.6065 +65:47:45.096 G0811935 11:05:50 13:02:32.6734 +61:28:02.118 G0767619 11:07:01 13:02:39.0307 +62:29:39.084 G0558303 11:08:19 13:15:12.257 +62:19:34.932 G0734489 11:09:32 13:27:54.4738 +65:50:30.5772 G1293606 11:10:53 15:11:17.1422 +72:42:43.8516 G0585517 11:12:04 15:26:34.5264 +75:04:16.23 G0496591 11:13:22 15:46:32.915 +72:10:09.0804 G0769048 11:14:31 15:52:28.5974 +70:22:30.522 G1325595 11:15:40 15:53:58.1398 +71:58:43.0392 G1306470 11:16:53 15:54:03.0799 +71:57:24.4044 G1295408 11:18:02 15:55:04.2334 +74:54:29.3112 G1236558 11:19:11 15:57:26.5392 +74:18:58.8708 G1361437 11:20:23 15:57:30.1428 +70:41:20.796 G1849594 11:21:32 15:57:30.48 +70:41:20.544 G0716651 11:22:41 16:01:25.8802 +71:23:55.6656 G1132485 11:23:51 16:10:49.4093 +74:55:02.2152 G0774750 11:25:04 16:44:36.8957 +75:40:23.088 //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 27167 SUBJECT: IPN triangulation of GRB 200219B (inconsistent with the LIGO/Virgo S200219ac) DATE: 20/02/22 02:55:08 GMT FROM: Anna Ridnaia at Ioffe Institute A. Ridnaia, S. Golenetskii, R. Aptekar, D. Frederiks, D. Svinkin, and T. Cline on behalf of the Konus-Wind team, K. Hurley, on behalf of the IPN, A. Goldstein, M. S. Briggs, and C. Wilson-Hodge on behalf of the Fermi GBM team, and A. von Kienlin, X. Zhang, A. Rau, V. Savchenko, E. Bozzo, and C. Ferrigno, on behalf of the INTEGRAL SPI-ACS GRB team, report: The long-duration GRB 200219B (Fermi-GBM detection: The Fermi GBM team, GCN 27127) has been detected by Fermi (GBM trigger 603798859), Konus-Wind, INTEGRAL (SPI-ACS), so far, at about 35652 s UT (09:54:12). We have triangulated it to a preliminary, 3 sigma error arc whose coordinates are: --------------------------------------------- RA(2000), deg Dec(2000), deg --------------------------------------------- Center: 305.322 (20h 21m 17s) +17.202 (+17d 12' 07") Corners: 303.847 (20h 15m 23s) +18.943 (+18d 56' 35") 288.913 (19h 15m 39s) -24.952 (-24d 57' 07") 293.218 (19h 32m 52s) -21.998 (-21d 59' 52") 306.769 (20h 27m 05s) +15.451 (+15d 27' 04") 348.097 (23h 12m 23s) +15.820 (+15d 49' 13") 352.740 (23h 30m 58s) +17.960 (+17d 57' 35") --------------------------------------------- The error arc area is 404.4 sq. deg, and its maximum dimension is ~81 deg (the minimum one is ~5 deg). The Sun distance was ~32 deg. The LIGO/Virgo S200219ac localization (LIGO/Virgo Collaboration, GCN Circ. 27130) is inconsistent with the arc. This arc may be improved. A triangulation map is posted at http://www.ioffe.ru/LEA/GRBs/GRB200219_T35651/IPN/ The time history and spectrum will be given in forthcoming GCN Circulars. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 27168 SUBJECT: LIGO/Virgo S200219ac : No significant candidates in TAROT - FRAM - GRANDMA observations. DATE: 20/02/22 12:42:17 GMT FROM: Martin Blazek at HETH/IAA-CSIC M. Blazek (HETH/IAA-CSIC), S. Antier (APC), N. Kochiashvili (Iliauni), C. Stachie (Artemis), (FZU), M. Boer (Artemis), N. Christensen (Artemis), L. Eymar (Artemis), S. Karpov (FZU), M. Prouza (FZU), A. Klotz (IRAP), M. Masek (FZU), K. Noysena (Artemis, IRAP), A. Coleiro (APC), D. Corre (IJCLab), M. Coughlin (UMN), D. Coward (OzGrav-UWA), J.-G. Ducoin (IJCLab), B. Gendre (OzGrav-UWA), P. Hello (IJCLab), D. A. Kann (HETH/IAA-CSIC), C. Lachaud (APC), N. Leroy (IJCLab), C. Thoene (HETH/IAA-CSIC), D. Turpin (AIM-CEA), X. Wang (THU) report on behalf of the FRAM, TAROT and GRANDMA collaborations. We performed tiled observations of LIGO/Virgo S200219ac event with the FRAM-CTA-N, TAROT-Calern (TCA), TAROT-Chili (TCH), TAROT-Reunion (TRE) telescopes. FRAM-CTA-N is located at Observatorio del Roque de los Muchachos. TCA is located at Calern site at the Cote d'Azur observatory. TCH is located at La Silla ESO observatory (LaS/ESO). TRE is located at Les Makes astronomical observatory. The following table shows for each telescope: the delay in minutes from the trigger, which filter is used, the field of view of the telescope in degrees and the typical limiting magnitude (AB mag) for a given exposure in seconds (s). +-------------+---------+----------+-------------+------------+ | Telescope | Delay | Filter | f.o.v. | Limiting | | | [min] | | [deg] | Mag. | |-------------+---------+----------+-------------+------------| | FRAM-CTA-N | 799 | R | 0.45 x 0.45 | 17.0 (90s) | | TCA | 512 | Clear | 1.9 x 1.9 | 18.0 (60s) | | TCH | 878 | Clear | 1.9 x 1.9 | 18.0 (60s) | | TRE | 367 | Clear | 4.2 x 4.2 | 17.0 (60s) | +-------------+---------+----------+-------------+------------+ We performed the following joint tiled observations [1] : +-------------+------------+------------+---------+---------+---------+ | Telescope | TStart | TEnd | RA | DEC | Proba | | | [UTC] | [UTC] | [deg] | [deg] | [%] | |-------------+------------+------------+---------+---------+---------| | FRAM-CTA-N | 2020-02-19 | 2020-02-19 | 189.377 | 55.273 | <0.1 | | | 23:03:15 | 23:07:21 | | | | | FRAM-CTA-N | 2020-02-19 | 2020-02-19 | 188.615 | 55.273 | <0.1 | | | 23:07:40 | 23:11:46 | | | | | FRAM-CTA-N | 2020-02-19 | 2020-02-19 | 188.613 | 53.963 | <0.1 | | | 23:12:01 | 23:16:07 | | | | | FRAM-CTA-N | 2020-02-19 | 2020-02-19 | 188.753 | 55.710 | <0.1 | | | 23:16:27 | 23:20:32 | | | | | FRAM-CTA-N | 2020-02-19 | 2020-02-19 | 190.140 | 55.273 | <0.1 | | | 23:20:52 | 23:24:59 | | | | | FRAM-CTA-N | 2020-02-19 | 2020-02-19 | 190.414 | 54.837 | <0.1 | | | 23:25:18 | 23:29:24 | | | | | FRAM-CTA-N | 2020-02-19 | 2020-02-19 | 189.749 | 55.710 | <0.1 | | | 23:29:43 | 23:33:49 | | | | | FRAM-CTA-N | 2020-02-19 | 2020-02-19 | 190.903 | 55.273 | <0.1 | | | 23:34:09 | 23:38:14 | | | | | FRAM-CTA-N | 2020-02-19 | 2020-02-19 | 188.149 | 54.837 | <0.1 | | | 23:38:30 | 23:42:35 | | | | | FRAM-CTA-N | 2020-02-19 | 2020-02-19 | 187.395 | 54.837 | <0.1 | | | 23:42:49 | 23:46:55 | | | | | FRAM-CTA-N | 2020-02-19 | 2020-02-19 | 188.796 | 56.147 | <0.1 | | | 23:47:11 | 23:51:17 | | | | | FRAM-CTA-N | 2020-02-19 | 2020-02-19 | 191.168 | 54.837 | <0.1 | | | 23:51:33 | 23:55:39 | | | | | FRAM-CTA-N | 2020-02-19 | 2020-02-20 | 189.465 | 53.963 | <0.1 | | | 23:55:54 | 00:00:00 | | | | | FRAM-CTA-N | 2020-02-20 | 2020-02-20 | 190.355 | 56.147 | <0.1 | | | 00:00:14 | 00:04:20 | | | | | FRAM-CTA-N | 2020-02-20 | 2020-02-20 | 190.204 | 53.963 | <0.1 | | | 00:04:35 | 00:08:41 | | | | | FRAM-CTA-N | 2020-02-20 | 2020-02-20 | 187.740 | 55.273 | <0.1 | | | 00:09:01 | 00:13:07 | | | | | FRAM-CTA-N | 2020-02-20 | 2020-02-20 | 189.659 | 54.837 | <0.1 | | | 00:13:22 | 00:17:28 | | | | | FRAM-CTA-N | 2020-02-20 | 2020-02-20 | 188.904 | 54.837 | <0.1 | | | 00:17:47 | 00:21:53 | | | | | FRAM-CTA-N | 2020-02-20 | 2020-02-20 | 189.576 | 56.147 | <0.1 | | | 00:22:06 | 00:26:12 | | | | | FRAM-CTA-N | 2020-02-20 | 2020-02-20 | 186.640 | 54.837 | <0.1 | | | 00:26:27 | 00:30:33 | | | | | ----- | ----- | ----- | ----- | ----- | ----- | | TCA | 2020-02-19 | 2020-02-21 | 192.726 | 57.548 | 0.6 | | | 18:16:12 | 20:26:32 | | | | | TCA | 2020-02-19 | 2020-02-21 | 174.910 | 39.897 | 0.5 | | | 18:22:58 | 18:00:16 | | | | | TCA | 2020-02-19 | 2020-02-21 | 192.200 | 61.259 | 0.5 | | | 18:29:42 | 20:38:56 | | | | | TCA | 2020-02-19 | 2020-02-21 | 190.840 | 63.115 | 0.5 | | | 19:08:04 | 21:18:11 | | | | | TCA | 2020-02-19 | 2020-02-21 | 177.326 | 40.847 | 0.4 | | | 19:14:52 | 21:24:53 | | | | | TCA | 2020-02-19 | 2020-02-21 | 190.593 | 55.692 | 1.0 | | | 19:21:37 | 19:21:14 | | | | | TCA | 2020-02-19 | 2020-02-21 | 186.852 | 51.981 | 0.7 | | | 19:53:22 | 20:00:37 | | | | | TCA | 2020-02-19 | 2020-02-21 | 193.807 | 55.692 | 0.6 | | | 20:06:56 | 20:13:03 | | | | | TCA | 2020-02-19 | 2020-02-21 | 194.796 | 63.115 | 0.6 | | | 20:13:40 | 20:19:48 | | | | | TCA | 2020-02-19 | 2020-02-21 | 195.950 | 61.259 | 0.5 | | | 20:45:18 | 20:45:44 | | | | | TCA | 2020-02-19 | 2020-02-21 | 185.997 | 57.548 | 0.5 | | | 20:52:07 | 20:59:12 | | | | | TCA | 2020-02-19 | 2020-02-21 | 177.226 | 42.703 | 0.5 | | | 20:58:52 | 18:35:14 | | | | | TCA | 2020-02-19 | 2020-02-21 | 187.379 | 55.692 | 0.9 | | | 21:37:08 | 19:34:43 | | | | | TCA | 2020-02-19 | 2020-02-20 | 185.565 | 53.837 | 0.7 | | | 21:50:41 | 02:16:35 | | | | | TCA | 2020-02-19 | 2020-02-21 | 189.361 | 57.548 | 0.7 | | | 21:57:25 | 19:53:56 | | | | | TCA | 2020-02-19 | 2020-02-21 | 184.164 | 55.692 | 0.5 | | | 23:14:53 | 18:41:59 | | | | | TCA | 2020-02-19 | 2020-02-21 | 191.719 | 53.837 | 0.8 | | | 23:53:28 | 04:41:22 | | | | | TCA | 2020-02-20 | 2020-02-21 | 189.803 | 51.981 | 0.6 | | | 00:19:17 | 05:07:04 | | | | | TCA | 2020-02-20 | 2020-02-21 | 183.901 | 51.981 | 0.5 | | | 01:05:11 | 20:52:27 | | | | | TCA | 2020-02-20 | 2020-02-21 | 188.642 | 53.837 | 1.0 | | | 01:50:02 | 19:27:59 | | | | | ----- | ----- | ----- | ----- | ----- | ----- | | TCH | 2020-02-20 | 2020-02-21 | 22.252 | -30.868 | 0.9 | | | 00:21:31 | 02:36:49 | | | | | TCH | 2020-02-20 | 2020-02-21 | 23.172 | -34.505 | 0.9 | | | 00:23:37 | 02:30:31 | | | | | TCH | 2020-02-20 | 2020-02-20 | 24.805 | -32.686 | 0.9 | | | 00:27:50 | 02:41:22 | | | | | TCH | 2020-02-20 | 2020-02-21 | 25.394 | -34.505 | 0.8 | | | 00:39:27 | 02:58:07 | | | | | TCH | 2020-02-20 | 2020-02-20 | 17.991 | -30.868 | 0.8 | | | 00:52:22 | 01:06:59 | | | | | TCH | 2020-02-20 | 2020-02-20 | 8.529 | -17.273 | 0.3 | | | 01:02:53 | 01:09:06 | | | | | TCH | 2020-02-20 | 2020-02-21 | 16.602 | -21.777 | 0.2 | | | 01:22:20 | 01:07:41 | | | | | TCH | 2020-02-20 | 2020-02-21 | 36.986 | -41.777 | 0.2 | | | 01:37:48 | 03:54:37 | | | | | TCH | 2020-02-20 | 2020-02-20 | 19.678 | -29.050 | 1.2 | | | 01:46:14 | 02:02:05 | | | | | TCH | 2020-02-20 | 2020-02-20 | 17.597 | -29.050 | 1.1 | | | 01:55:52 | 02:04:11 | | | | | TCH | 2020-02-20 | 2020-02-21 | 17.314 | -27.232 | 1.1 | | | 01:57:59 | 02:06:44 | | | | | TCH | 2020-02-20 | 2020-02-20 | 22.637 | -32.686 | 1.0 | | | 02:10:36 | 02:19:09 | | | | | TCH | 2020-02-20 | 2020-02-20 | 20.122 | -30.868 | 1.0 | | | 02:20:12 | 02:32:57 | | | | | TCH | 2020-02-20 | 2020-02-21 | 170.011 | 25.495 | 0.2 | | | 03:47:11 | 06:30:53 | | | | | TCH | 2020-02-21 | 2020-02-21 | 20.468 | -32.686 | 0.8 | | | 00:30:45 | 00:36:57 | | | | | TCH | 2020-02-21 | 2020-02-21 | 8.450 | -14.980 | 0.3 | | | 00:45:55 | 00:54:14 | | | | | TCH | 2020-02-21 | 2020-02-21 | 6.634 | -16.323 | 0.2 | | | 00:54:20 | 00:58:26 | | | | | TCH | 2020-02-21 | 2020-02-21 | 19.359 | -27.232 | 1.0 | | | 02:11:27 | 02:24:12 | | | | | ----- | ----- | ----- | ----- | ----- | ----- | | TRE | 2020-02-19 | 2020-02-19 | 14.595 | -32.727 | 0.6 | | | 15:51:04 | 15:57:26 | | | | | TRE | 2020-02-19 | 2020-02-20 | 24.324 | -32.727 | 4.1 | | | 16:04:16 | 15:57:55 | | | | | TRE | 2020-02-19 | 2020-02-20 | 18.000 | -24.545 | 2.9 | | | 16:16:33 | 16:11:12 | | | | | TRE | 2020-02-19 | 2020-02-20 | 25.714 | -36.818 | 2.2 | | | 16:42:21 | 16:36:33 | | | | | TRE | 2020-02-19 | 2020-02-20 | 14.026 | -28.636 | 1.6 | | | 17:13:59 | 17:08:08 | | | | | TRE | 2020-02-19 | 2020-02-20 | 46.452 | -45.000 | 1.2 | | | 17:52:19 | 17:46:24 | | | | | TRE | 2020-02-19 | 2020-02-20 | 30.857 | -36.818 | 0.9 | | | 18:17:49 | 18:12:03 | | | | | TRE | 2020-02-19 | 2020-02-20 | 34.839 | -45.000 | 0.7 | | | 18:45:31 | 18:37:29 | | | | | TRE | 2020-02-19 | 2020-02-20 | 165.405 | 32.727 | 0.7 | | | 18:56:44 | 18:50:56 | | | | | TRE | 2020-02-19 | 2020-02-19 | 170.270 | 32.727 | 2.4 | | | 20:17:26 | 20:23:42 | | | | | TRE | 2020-02-19 | 2020-02-20 | 175.135 | 32.727 | 1.6 | | | 20:49:04 | 21:53:11 | | | | | TRE | 2020-02-19 | 2020-02-20 | 168.312 | 28.636 | 1.4 | | | 21:20:58 | 22:25:08 | | | | | TRE | 2020-02-19 | 2020-02-19 | 172.987 | 28.636 | 1.1 | | | 21:53:12 | 21:59:28 | | | | | TRE | 2020-02-19 | 2020-02-20 | 166.500 | 24.545 | 0.7 | | | 22:37:46 | 23:43:55 | | | | | TRE | 2020-02-20 | 2020-02-20 | 50.526 | -49.091 | 1.4 | | | 17:14:45 | 17:21:01 | | | | | TRE | 2020-02-20 | 2020-02-20 | 20.571 | -36.818 | 1.2 | | | 17:27:55 | 17:34:12 | | | | +-------------+------------+------------+---------+---------+---------+ TStart and TEnd refers respectively to the time of the first and last exposure for a given tile. Observations are not necessarily continuous in this interval. The Probability refers to the 2D spatial probability of the GW skymap enclosed in a given tile. These observations cover about 44.0% of the cumulative probability of the BAYESTAR skymap created on 2020-02-19 11:14:17 (UTC). The coverage map is available at: https://grandma- owncloud.lal.in2p3.fr/index.php/s/XgtMhPRxcyL09gR/download? path=%2F&files=GRANDMA_S200219ac_1582328915.svg No significant transient candidates were found during our low latency analysis [2,3]. GRANDMA (Global Rapid Advanced Network Devoted to the Multi-messenger Addicts) is a network of robotic telescopes connected all over the world with both photometry and spectrometry capabilities for Time- domain Astronomy [2](https://grandma.lal.in2p3.fr/). Details on the different telescopes are available on the GRANDMA web pages. [1] M. W Coughlin et al., MNRAS 2019, https://doi.org/10.1093/mnras/stz2485 [2] S. Antier et al., MNRAS 2020, https://doi.org/10.1093/mnras/stz3142 [3] K. Noysena et al., ApJ 2019, arXiv:1910.02770 //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 27169 SUBJECT: LIGO/Virgo S200219ac: no counterpart candidate in SVOM/GWAC observations DATE: 20/02/23 16:49:40 GMT FROM: Jean-Gregoire Ducoin at LAL J.-G. Ducoin(IJCLab), X. G. Wang (GXU), N. Leroy (CNRS/LAL), J. R. Mao (YNAO), S. S. Sun (GXU) report on behalf of the SVOM Multi Messenger Astronomy and GWAC teams (http://www.svom.fr/en/svom-mma-and-gwac-team): We observed 13 (~1950 square deg) sky regions to cover the skymap of the advanced LIGO/Virgo trigger S200219ac (GCN # 27130), with SVOM/GWAC, at Xinglong Observatory. SVOM/GWAC is equipped with two sets of wide angle cameras: - FFOV cameras (FOV~900 square degrees/camera, aperture = 3.5 cm), - JFOV cameras (FOV~150 square degrees/camera, aperture = 18 cm). SVOM/GWAC currently comprises 4 FFOV cameras and 16 JFOV cameras, working in the unfiltered band. The observations are operated in time-series mode, taking one exposure every 25 seconds (20s exposure + 5s readout). The observed and processed regions enclosed an estimated 42.7% of the probability of the advanced LIGO/Virgo skymap. Images were taken between ~3 hours and ~8 hours after the GW trigger time. The coordinates of the 13 sky regions observed and their observation times and covered probability are listed below: Id Ra Dec start (UTC) end (UTC) Proba. Cam. 1 10:18:57.60 31:33:11 2020-02-19 12:30:12 2020-02-19 12:58:20 0.002 JFOV 2 11:10:06.00 19:17:33 2020-02-19 12:30:12 2020-02-19 12:58:20 0.024 JFOV 3 10:21:27.60 19:30:50 2020-02-19 12:30:12 2020-02-19 12:58:20 0.009 JFOV 4 11:00:30.00 18:22:24 2020-02-19 12:01:13 2020-02-19 12:29:28 0.024 JFOV 5 11:15:24.24 35:32:37 2020-02-19 12:30:20 2020-02-19 13:30:58 0.114 JFOV 6 11:34:14.64 31:33:03 2020-02-19 13:32:46 2020-02-19 14:00:55 0.106 JFOV 7 11:36:40.32 19:31:06 2020-02-19 13:32:46 2020-02-19 14:00:55 0.008 JFOV 8 11:51:46.80 48:34:54 2020-02-19 14:03:35 2020-02-19 15:03:39 0.096 JFOV 9 11:57:32.16 36:34:18 2020-02-19 14:03:35 2020-02-19 15:03:39 0.090 JFOV 10 12:54:39.12 52:06:30 2020-02-19 13:41:16 2020-02-19 14:42:13 0.115 JFOV 11 13:34:29.04 65:10:48 2020-02-19 15:45:36 2020-02-19 17:19:54 0.058 JFOV 12 13:49:30.96 53:16:58 2020-02-19 15:44:30 2020-02-19 17:19:54 0.007 JFOV 13 15:15:08.40 68:44:16 2020-02-19 15:49:58 2020-02-19 16:46:14 0.010 JFOV The sky coverage map is available at: http://cmm.svom.cn/gwpub/O3/S200219ac/S200219ac.png (user:svomo3 pwd:gwo3). Weather conditions were clear during the observations. An average 3-sigma limiting magnitude of 16 mag in the R band was obtained in the single frames. No credible new source was detected by our online pipeline during follow-up observations. A more detailed image analysis including co-addition is ongoing with our offline pipeline to search for transient candidates. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 27170 SUBJECT: LIGO/Virgo S200219ac: no counterpart candidate in SVOM/GWAC-F30 observations DATE: 20/02/23 16:51:00 GMT FROM: Jean-Gregoire Ducoin at LAL J.-G. Ducoin(IJCLab), X. G. Wang (GXU), N. Leroy (IJCLab), J. R. Mao (YNAO), S. S. Sun (GXU) report on behalf of the SVOM Multi Messenger Astronomy and GWAC teams (http://www.svom.fr/en/svom-mma-and-gwac-team): We observed 49 sky regions to cover the initial skymap of the LIGO/Virgo trigger S200219ac (GCN # 27130), with the SVOM/GWAC-F30 telescope operated by Huaibei Normal University and NAOC, CAS at Xinglong Observatory, China. The SVOM/GWAC-F30 is equipped with Standard Johnson filters and 4Kx4K FLI CCD (FOV~1.8x1.8 degree). The GWAC-F30 is using tiling observation strategy. The tiles are calculated to cover the most probable regions of the 90% localization area given in the GW probability skymap. 5 images with a single exposure of 70s time in R band are taken for each tile. The typical limiting magnitude of our image is 17 mag in the R band calibrated to USNO B1.0 R2. The 49 tile coordinates and the observation periods are listed below: Id Ra Dec start (UTC) end (UTC) Proba. 1 12:34:24.9 +55:24:20 2020-02-19 12:28:28.8 2020-02-19 13:47:43.6 0.010 2 11:36:46.7 +30:25:48 2020-02-19 13:56:11.9 2020-02-19 14:02:11.4 0.003 3 12:46:06.2 +55:24:14 2020-02-19 13:49:44.7 2020-02-19 13:54:30.6 0.009 4 11:28:40.5 +33:07:23 2020-02-19 14:58:19.7 2020-02-19 15:04:15.0 0.006 5 11:33:55.8 +34:49:07 2020-02-19 14:44:14.0 2020-02-19 14:50:09.3 0.006 6 11:36:49.6 +30:26:29 2020-02-19 14:20:45.9 2020-02-19 14:26:39.3 0.003 7 11:37:10.4 +55:57:27 2020-02-19 14:51:33.9 2020-02-19 14:56:47.2 0.000 8 12:22:43.0 +55:24:12 2020-02-19 14:28:44.7 2020-02-19 14:35:09.6 0.007 9 12:27:07.8 +53:41:48 2020-02-19 14:12:38.7 2020-02-19 14:19:03.7 0.009 10 12:43:01.0 +57:05:13 2020-02-19 14:04:12.0 2020-02-19 14:10:32.9 0.007 11 12:49:37.7 +53:41:05 2020-02-19 14:36:51.9 2020-02-19 14:42:29.6 0.008 12 11:24:08.0 +31:26:19 2020-02-19 15:46:32.4 2020-02-19 15:51:38.1 0.006 13 11:25:42.6 +34:49:40 2020-02-19 15:12:18.1 2020-02-19 15:17:17.4 0.006 14 11:31:40.5 +36:31:26 2020-02-19 15:05:39.4 2020-02-19 15:10:32.8 0.006 15 11:38:28.8 +38:13:57 2020-02-19 15:39:54.2 2020-02-19 15:45:01.7 0.006 16 11:40:00.8 +36:32:08 2020-02-19 15:53:29.0 2020-02-19 15:58:33.5 0.006 17 12:21:13.8 +51:48:38 2020-02-19 15:19:17.6 2020-02-19 15:24:17.0 0.006 18 12:50:36.6 +62:00:08 2020-02-19 15:26:07.1 2020-02-19 15:31:12.0 0.006 19 13:04:44.7 +61:59:58 2020-02-19 15:32:57.4 2020-02-19 15:37:56.9 0.006 20 11:20:32.9 +33:08:45 2020-02-19 16:14:04.3 2020-02-19 16:19:05.9 0.006 21 11:29:49.9 +38:14:53 2020-02-19 16:34:53.3 2020-02-19 16:39:54.4 0.005 22 11:36:37.8 +33:08:44 2020-02-19 16:28:04.3 2020-02-19 16:33:08.7 0.005 23 11:37:21.5 +39:56:53 2020-02-19 16:41:22.1 2020-02-19 16:46:26.8 0.005 24 12:15:54.9 +53:32:34 2020-02-19 16:48:18.2 2020-02-19 16:53:20.2 0.006 25 12:40:18.4 +58:38:27 2020-02-19 16:55:19.0 2020-02-19 17:00:25.6 0.005 26 12:42:46.0 +51:49:31 2020-02-19 16:20:51.0 2020-02-19 16:25:56.8 0.006 27 12:55:21.0 +56:54:48 2020-02-19 16:00:25.9 2020-02-19 16:05:25.8 0.005 28 12:57:54.9 +55:12:56 2020-02-19 16:07:06.3 2020-02-19 16:12:09.0 0.005 29 11:23:02.2 +36:33:40 2020-02-19 17:58:39.8 2020-02-19 18:03:45.8 0.005 30 11:31:58.5 +31:27:11 2020-02-19 17:02:15.8 2020-02-19 17:07:17.5 0.005 31 11:41:56.8 +34:51:32 2020-02-19 17:37:04.6 2020-02-19 17:42:11.3 0.004 32 11:45:53.7 +41:39:02 2020-02-19 17:08:59.7 2020-02-19 17:14:08.0 0.005 33 11:46:04.7 +39:57:07 2020-02-19 17:16:13.7 2020-02-19 17:21:20.1 0.005 34 11:46:14.2 +43:21:28 2020-02-19 17:44:12.3 2020-02-19 17:49:17.3 0.004 35 12:49:49.3 +63:45:08 2020-02-19 17:23:14.2 2020-02-19 17:28:21.0 0.005 36 12:51:19.0 +60:21:29 2020-02-19 17:51:25.9 2020-02-19 17:56:30.9 0.005 37 13:04:46.4 +63:45:05 2020-02-19 17:30:16.0 2020-02-19 17:35:17.2 0.004 38 11:16:00.3 +31:27:07 2020-02-19 18:33:56.2 2020-02-19 18:39:03.9 0.005 39 11:46:49.8 +38:15:31 2020-02-19 18:05:27.3 2020-02-19 18:10:34.6 0.004 40 11:55:26.3 +43:21:34 2020-02-19 18:12:31.4 2020-02-19 18:17:41.8 0.004 41 12:15:50.0 +50:09:45 2020-02-19 18:19:52.3 2020-02-19 18:25:00.3 0.005 42 12:52:50.3 +58:39:49 2020-02-19 18:27:04.6 2020-02-19 18:32:06.9 0.004 43 11:17:04.2 +34:50:41 2020-02-19 19:36:36.2 2020-02-19 19:41:42.0 0.004 44 11:36:35.4 +41:39:15 2020-02-19 19:22:28.5 2020-02-19 19:27:36.9 0.004 45 11:54:34.7 +41:39:16 2020-02-19 19:29:42.3 2020-02-19 19:34:52.2 0.004 46 11:56:38.1 +45:03:23 2020-02-19 19:01:51.7 2020-02-19 19:06:53.4 0.004 47 12:18:00.9 +56:57:17 2020-02-19 19:51:06.9 2020-02-19 19:56:11.4 0.004 48 12:26:10.1 +50:09:41 2020-02-19 19:08:35.7 2020-02-19 19:13:39.8 0.005 49 13:04:29.7 +60:21:41 2020-02-19 19:15:28.4 2020-02-19 19:20:33.1 0.005 The covering map is available at: http://cmm.svom.cn/gwpub/O3/S200219ac/S200219ac_F30.png (user:svomo3 pwd:gwo3) The first image was taken ~3 hours after the event trigger time. No credible new source is detected by our online pipeline. A more detailed image analysis is in progress with our offline pipeline to search for any fainter transient candidate. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 27196 SUBJECT: LIGO/Virgo S200219ac: No counterpart candidates from Nanshan/NEXT observations DATE: 20/02/25 07:26:25 GMT FROM: Dong Xu at NAOC/CAS Z.P. Zhu, D. Xu, X. Liu, B.Y. Yu, H.J. Wang, L. Ge, C.Z. Cui, Y.F. Xu, T.M. Zhang, X. Zhou, (NAOC), X. Gao (Urumqi No.1 Senior High School), S. Yang (Stockholm U.), H.B. Zhao, B. Li (PMO), J.Z. Liu, X. Zhang (XAO), J.R. Mao (YNAO) report on behalf of the GWFUNC collaboration: We observed 275 GLADE galaxy fields that are selected according to the probability sky map of LIGO/Virgo S200219ac (GCN 27130), the B-band absolute magnitude for the galaxy < -18, as well as the observable altitude > ~30 deg with respect to the NEXT 0.6m optical telescope, located at Nanshan, Xinjiang, China. Observations started at 12:26:21 UT and ended at 22:40:03 UT on 2020-02-19 in the Sloan r-filter, with 90 sec for each exposure. Typical limiting magnitude is of r~19.0. No credible optical counterpart was identified in all the galaxies. Full analysis is still ongoing. The list of the observed galaxies is given below. Galaxy_Name R.A.(deg) Dec.(deg) Dist(Mpc) M_B GL12291559+5838076 187.31500 58.63547 824.14 -20.57 GL12310095+5841156 187.75400 58.68767 688.65 -20.63 GL12530791+6334088 193.28300 63.56913 1706.08 -20.62 GL12554103+6331366 193.92099 63.52685 859.01 -21.20 GL12162400+5619433 184.10000 56.32872 1445.44 -20.90 GL12204200+5617097 185.17500 56.28604 1148.15 -20.49 GL12444608+6130585 191.19200 61.51625 1122.02 -21.42 GL12153048+5502200 183.87700 55.03889 1706.08 -20.73 GL12382063+6054212 189.58600 60.90590 1745.82 -20.71 GL11304181+3948444 172.67425 39.81234 866.96 -21.34 GL11512136+4506190 177.83900 45.10529 1028.02 -20.97 GL11531151+4507188 178.29800 45.12189 916.22 -20.82 GL11570576+4505440 179.27400 45.09556 1905.46 -20.92 GL12143407+5218097 183.64200 52.30272 1336.60 -20.76 GL12173840+5217259 184.41000 52.29055 801.68 -20.52 GL12240936+5221303 186.03900 52.35842 783.43 -20.92 GL12250261+5219310 186.26090 52.32528 732.30 -21.43 GL11154421+3220386 168.93422 32.34407 1061.70 -21.18 GL12574991+5628485 194.45800 56.48016 1432.19 -20.21 GL12343808+5417150 188.65869 54.28751 1066.60 -21.38 GL12365327+5421081 189.22200 54.35227 903.65 -21.07 GL12412111+5424184 190.33800 54.40513 1770.11 -21.33 GL12453499+5422302 191.39580 54.37506 1174.90 -21.62 GL12480768+5424302 192.03200 54.40841 1367.73 -21.95 GL12490733+5421347 192.28055 54.35966 1180.32 -21.50 GL12500815+5423362 192.53400 54.39340 1706.08 -21.29 GL12000880+4506574 180.03668 45.11596 1318.26 -23.40 GL12012231+4502539 180.34300 45.04832 1870.68 -20.62 GL12014991+4505598 180.45800 45.09997 1870.68 -20.72 GL12035519+4507599 180.98000 45.13333 912.01 -20.74 GL12290281+5219514 187.26175 52.33096 1076.47 -21.18 GL12324344+5214175 188.18100 52.23821 1651.96 -20.55 GL12333576+5220160 188.39900 52.33779 1061.70 -20.76 GL12343576+5219169 188.64900 52.32137 1051.96 -21.54 GL11395364+3539583 174.97354 35.66621 928.97 -20.98 GL12404680+5214012 190.19500 52.23369 866.96 -20.76 GL12481872+5221490 192.07800 52.36362 1023.29 -20.91 GL12530023+5216390 193.25100 52.27751 1342.76 -20.86 GL11404584+4326353 175.19100 43.44314 1230.27 -21.28 GL11415640+4321244 175.48500 43.35680 895.37 -21.47 GL11453480+4321004 176.39500 43.35013 1584.89 -21.71 GL11471727+4324157 176.82200 43.40437 1548.82 -20.89 GL12324511+5835085 188.18800 58.58572 851.14 -20.74 GL11491896+4322367 177.32900 43.37687 1629.30 -20.48 GL11552843+4325113 178.86848 43.41983 724.44 -20.80 GL12442971+5838107 191.12380 58.63632 1412.54 -21.94 GL11591230+4329081 179.80127 43.48559 1445.44 -21.44 GL12480623+5841400 192.02600 58.69445 950.61 -20.59 GL12554127+5839214 193.92200 58.65597 698.23 -20.55 GL12535782+6102089 193.49092 61.03582 790.68 -21.08 GL12555376+6100147 193.97400 61.00410 1086.43 -20.96 GL12590905+6057127 194.78775 60.95355 1094.04 -21.45 GL13024103+6056015 195.67100 60.93375 1706.08 -20.68 GL13091895+6100319 197.32896 61.00887 702.96 -21.23 GL13134655+6059074 198.44400 60.98541 1614.36 -20.84 GL13145568+6057350 198.73200 60.95974 1659.59 -21.05 GL11331185+3306003 173.29938 33.10010 941.89 -19.95 GL12121415+5024583 183.05900 50.41621 1778.28 -20.96 GL12153863+5021541 183.91100 50.36503 866.96 -20.55 GL12165087+5018422 184.21200 50.31174 862.98 -20.99 GL12165807+5026337 184.24200 50.44272 1940.89 -21.33 GL12180647+5021347 184.52700 50.35965 1949.84 -20.29 GL12201511+5019345 185.06300 50.32627 1976.97 -20.73 GL12214954+5023106 185.45642 50.38629 950.61 -21.34 GL12311183+5022337 187.79932 50.37605 1294.20 -21.38 GL12322280+5026203 188.09500 50.43900 1300.17 -21.07 GL12331176+5027018 188.29900 50.45051 1527.57 -21.06 GL12345736+5021278 188.73900 50.35774 1004.62 -20.76 GL11581589+4645479 179.56621 46.76333 1288.25 -21.06 GL11591857+4646341 179.82741 46.77615 899.50 -20.75 GL12032855+4648060 180.86900 46.80167 1995.26 -20.73 GL12043541+4641592 181.14755 46.69978 1330.45 -23.42 GL12090168+4646446 182.25700 46.77908 1753.88 -20.10 GL13042831+6335591 196.11800 63.59976 1534.62 -20.63 GL13084345+6328580 197.18105 63.48280 820.21 -21.29 GL13111200+6327497 197.80000 63.46383 827.94 -21.01 GL13130336+6332352 198.26400 63.54313 924.70 -21.25 GL12011451+4830585 180.31050 48.51626 1361.44 -20.73 GL12030048+4830362 180.75200 48.51007 1753.88 -20.71 GL12034034+4833557 180.91812 48.56550 758.58 -21.29 GL12043863+4829463 181.16100 48.49621 765.60 -21.04 GL12224223+5619316 185.67600 56.32547 1713.96 -20.93 GL12252496+5621227 186.35400 56.35631 1836.54 -20.47 GL12502087+5621132 192.58700 56.35367 1621.81 -20.82 GL12551511+5618112 193.81300 56.30313 1845.02 -20.55 GL13000258+5621441 195.01076 56.36227 1009.25 -21.28 GL12133340+5416086 183.38919 54.26906 862.98 -20.95 GL12330072+5414517 188.25300 54.24770 1367.73 -21.29 GL12344848+5414322 188.70200 54.24230 1614.36 -20.49 GL12354691+5414341 188.94548 54.24282 924.70 -21.18 GL12365519+5415300 189.22996 54.25834 1086.43 -21.40 GL12373337+5418061 189.38905 54.30170 916.22 -20.93 GL12382780+5418224 189.61587 54.30624 1076.47 -21.67 GL12394920+5415445 189.95500 54.26237 920.45 -20.98 GL12443402+5416517 191.14178 54.28105 938.37 -21.08 GL12342663+5830102 188.61100 58.50286 1028.02 -20.65 GL12442988+5833050 191.12454 58.55141 1235.95 -21.32 GL12493815+5829507 192.40900 58.49742 1492.79 -21.72 GL12533090+6048579 193.37875 60.81611 1011.80 -21.53 GL12580408+6050279 194.51700 60.84109 741.31 -20.87 GL12594176+6056582 194.92400 60.94950 762.08 -20.92 GL13012808+6051230 195.36700 60.85639 1651.96 -21.38 GL13023696+6049289 195.65400 60.82470 941.89 -21.05 GL13041583+6053332 196.06600 60.89256 1761.98 -20.19 GL13082304+6051182 197.09602 60.85506 717.31 -21.10 GL13091194+6051149 197.29976 60.85415 711.21 -20.23 GL11141765+3242437 168.57356 32.71215 1000.00 -21.51 GL11144368+3243365 168.68200 32.72683 1018.59 -20.68 GL11154596+3118326 168.94153 31.30907 1056.82 -21.52 GL11171776+3241534 169.32400 32.69819 1465.55 -21.53 GL11174304+3116484 169.42935 31.28013 810.00 -21.35 GL11183379+3115167 169.64082 31.25464 1087.36 -21.59 GL11191008+3245457 169.79200 32.76271 1506.61 -20.38 GL11202515+2954278 170.10480 29.90774 1174.90 -20.88 GL11232784+3405097 170.86600 34.08604 707.95 -20.27 GL11242280+2953560 171.09500 29.89890 809.10 -20.89 GL11244200+2955429 171.17500 29.92861 812.83 -20.32 GL11253911+3836228 171.41296 38.60636 941.89 -22.00 GL11260336+3244349 171.51400 32.74305 977.24 -20.70 GL11265280+2958170 171.72000 29.97141 1845.02 -21.04 GL11273359+3242157 171.89000 32.70438 1230.27 -21.12 GL11282141+3533117 172.08923 35.55327 748.17 -19.45 GL11290455+3830439 172.26900 38.51222 717.79 -21.19 GL11294935+3832085 172.45566 38.53570 941.89 -21.59 GL11311264+4006405 172.80270 40.11127 981.75 -20.04 GL11313984+3242486 172.91600 32.71352 787.05 -20.85 GL11323541+3833081 173.14757 38.55227 1096.48 -22.05 GL12161103+5213363 184.04600 52.22675 794.33 -20.53 GL11340768+3832501 173.53200 38.54725 1306.17 -21.92 GL12175544+5216227 184.48100 52.27298 776.25 -20.42 GL11353119+4004324 173.88000 40.07567 883.08 -21.28 GL11360503+3404314 174.02100 34.07541 835.60 -21.32 GL12205063+5216081 185.21100 52.26894 741.31 -20.57 GL11372663+3410224 174.36100 34.17291 765.60 -21.07 GL11381078+3237525 174.54495 32.63127 1445.18 -21.45 GL11383815+3409182 174.65900 34.15507 887.16 -20.99 GL12254079+5212081 186.42000 52.20226 1753.88 -20.21 GL11405184+3837411 175.21600 38.62809 928.97 -21.39 GL11423048+4145194 175.62700 41.75539 879.02 -20.77 GL11432190+3836117 175.84125 38.60326 831.76 -20.74 GL11451542+4010510 176.31427 40.18086 835.60 -21.90 GL11460106+3708414 176.50442 37.14485 772.68 -21.26 GL12325831+5218196 188.24300 52.30547 920.45 -21.15 GL11471752+3708009 176.82300 37.13359 870.96 -21.06 GL11485255+3834044 177.21899 38.56791 1142.88 -23.09 GL12364559+5215104 189.19000 52.25291 1967.89 -21.09 GL11500888+4139104 177.53700 41.65289 1520.55 -21.18 GL11504799+4145473 177.70000 41.76315 1202.26 -20.67 GL12411615+5210433 190.31731 52.17871 866.96 -21.64 GL11535855+4142517 178.49400 41.71437 1202.26 -21.09 GL11551752+4141042 178.82300 41.68452 1923.09 -20.95 GL11563894+4144316 179.16226 41.74212 856.80 -21.34 GL12480368+5212512 192.01537 52.21424 801.68 -21.17 GL12491008+5216130 192.29200 52.27029 1312.20 -19.30 GL12500647+5212217 192.52700 52.20604 1148.15 -19.07 GL12013312+4500402 180.38800 45.01119 1122.02 -21.25 GL12383383+6324313 189.64100 63.40872 1142.88 -21.11 GL12512040+6327460 192.83500 63.46280 1520.55 -20.64 GL13021061+6323070 195.54425 63.38530 757.94 -21.04 GL13023696+6326564 195.65400 63.44901 1706.08 -21.58 GL13065831+6329158 196.74300 63.48774 711.21 -20.55 GL13080888+6329410 197.03700 63.49473 990.83 -20.82 GL13105951+6328098 197.74800 63.46939 920.45 -20.71 GL13115964+6327508 197.99854 63.46413 820.35 -20.54 GL11351223+3055560 173.80100 30.93224 779.83 -20.81 GL11361537+3234536 174.06406 32.58158 783.43 -21.09 GL11445208+4313474 176.21700 43.22984 843.34 -21.00 GL11490359+4319077 177.26500 43.31882 1202.26 -21.53 GL11492197+4315182 177.34157 43.25508 1570.36 -21.08 GL11500000+4316195 177.50000 43.27210 1995.26 -20.64 GL11512793+4314211 177.86641 43.23922 1185.77 -21.62 GL11535384+4317028 178.47437 43.28413 895.88 -21.12 GL11543082+4316491 178.62843 43.28031 959.40 -21.36 GL11560672+4317057 179.02800 43.28493 1682.67 -20.29 GL12052448+5016365 181.35200 50.27681 1786.49 -20.93 GL12064943+5020196 181.70600 50.33879 1887.99 -20.19 GL12105687+5016229 182.73700 50.27304 1091.44 -21.59 GL12110072+5018440 182.75300 50.31224 1786.49 -20.70 GL12130215+5018304 183.25900 50.30845 1778.28 -20.51 GL12180312+5017281 184.51300 50.29115 920.45 -21.07 GL12184511+5019371 184.68800 50.32698 1931.97 -20.10 GL12230144+5021385 185.75600 50.36072 1976.97 -20.63 GL12305640+5016360 187.73500 50.27667 928.97 -20.88 GL12320312+5014034 188.01300 50.23428 1294.20 -20.70 GL12580169+6047594 194.50708 60.79984 741.03 -21.48 GL11392756+3719243 174.86485 37.32344 899.50 -21.50 GL11334729+3604444 173.44705 36.07900 789.20 -21.36 GL11525752+4641541 178.23969 46.69838 839.46 -20.42 GL11533600+4644184 178.40000 46.73847 1584.89 -20.04 GL11541128+4641379 178.54703 46.69387 1164.13 -21.04 GL11582214+4644476 179.59227 46.74657 711.21 -20.41 GL11595448+4639452 179.97700 46.66258 891.25 -20.90 GL12041986+4636572 181.08276 46.61591 1023.29 -21.03 GL12051367+4638580 181.30698 46.64945 1342.76 -23.44 GL12075376+4643595 181.97400 46.73322 963.83 -20.70 GL12000690+4828271 180.02879 48.47421 776.25 -20.46 GL12014176+4825448 180.42404 48.42912 1004.62 -21.35 GL12042423+4828462 181.10100 48.47952 758.58 -20.35 GL12083187+4828113 182.13283 48.46982 779.83 -21.42 GL12102807+4822338 182.61700 48.37606 883.08 -20.50 GL12143407+5616470 183.64200 56.27973 794.33 -20.77 GL12161391+5613106 184.05800 56.21962 1803.02 -20.57 GL12241631+5613344 186.06800 56.22624 1729.82 -20.78 GL12322759+5610432 188.11500 56.17868 1534.62 -20.86 GL12371488+5616246 189.31200 56.27351 1845.02 -20.28 GL11255475+3523490 171.47813 35.39696 924.70 -19.91 GL12472087+5610204 191.83700 56.17234 1659.59 -21.40 GL12500023+5617017 192.50100 56.28381 1614.36 -20.93 GL12514608+5617097 192.94200 56.28603 1142.88 -20.54 GL12570551+5616176 194.27300 56.27158 721.11 -20.69 GL12584511+5619241 194.68800 56.32337 1563.15 -20.63 GL12595831+5612281 194.99300 56.20783 912.01 -20.78 GL13003240+5614237 195.13500 56.23993 912.01 -20.82 GL12413768+5838105 190.40700 58.63627 711.21 -20.47 GL12173888+5407109 184.41200 54.11970 1191.24 -20.24 GL12201511+5410198 185.06300 54.17219 1061.70 -21.63 GL12205544+5408346 185.23100 54.14295 1520.55 -20.66 GL12222951+5413352 185.62300 54.22647 1412.54 -21.55 GL12253815+5410070 186.40900 54.16863 1324.34 -21.27 GL12304056+5405318 187.66900 54.09219 1737.80 -20.31 GL12325015+5411488 188.20900 54.19690 1374.04 -21.37 GL12360815+5408298 189.03400 54.14163 1132.40 -21.05 GL12420359+5413429 190.51500 54.22859 933.25 -21.05 GL12553936+5409295 193.91400 54.15820 950.61 -20.95 GL12481938+6047470 192.08077 60.79639 839.46 -21.19 GL12504680+6048486 192.69500 60.81352 1106.62 -20.79 GL12561511+6048469 194.06300 60.81304 1294.20 -21.00 GL13084823+6050536 197.20100 60.84824 1614.36 -21.32 GL12240888+5824382 186.03700 58.41063 839.46 -21.28 GL12304991+5829517 187.70800 58.49771 851.14 -21.06 GL12493954+5827430 192.41478 58.46196 916.94 -21.76 GL12520095+5828182 193.00400 58.47173 758.58 -20.29 GL12532807+5828573 193.36700 58.48259 701.46 -21.11 GL12544049+5826434 193.66875 58.44541 713.06 -21.30 GL12550424+5831553 193.76767 58.53205 690.82 -21.16 GL12485304+6324301 192.22100 63.40837 765.60 -20.68 GL12501704+6325203 192.57100 63.42231 790.68 -21.02 GL12542400+6318532 193.60000 63.31478 1520.55 -20.85 GL12570095+6319139 194.25400 63.32054 1570.36 -21.04 GL13003768+6318540 195.15700 63.31500 1698.24 -19.99 GL13031608+6316132 195.81700 63.27036 899.50 -20.89 GL13045352+6322417 196.22300 63.37826 1690.44 -20.52 GL13084792+6319558 197.19969 63.33217 798.00 -20.38 GL13142975+6317121 198.62400 63.28671 1644.37 -20.58 GL13163456+6324305 199.14400 63.40848 758.58 -20.59 GL11295368+3436315 172.47368 34.60876 920.45 -21.03 GL12171344+5207308 184.30600 52.12525 1737.80 -19.94 GL12181943+5204028 184.58100 52.06745 1037.53 -21.30 GL12203095+5208509 185.12900 52.14748 794.33 -20.55 GL12253431+5202056 186.39300 52.03491 862.98 -21.24 GL12351511+5203363 188.81300 52.06011 1406.05 -20.24 GL12352949+5208338 188.87288 52.14275 1086.43 -21.33 GL12383239+5209245 189.63496 52.15683 1061.70 -21.35 GL12394272+5203284 189.92800 52.05791 1164.13 -21.15 GL11145936+3313370 168.74736 33.22697 790.68 -21.08 GL11192021+3232233 169.83421 32.53981 702.51 -21.40 GL11195136+2900424 169.96400 29.01179 1761.98 -20.53 GL11211707+3355598 170.32114 33.93328 972.75 -20.02 GL11244092+2945268 171.17052 29.75747 977.24 -20.84 GL11253517+3611178 171.39655 36.18830 954.99 -19.98 GL11260950+3606047 171.53961 36.10132 1037.53 -20.16 GL11265302+3230419 171.72092 32.51166 990.83 -20.80 GL11272184+3026430 171.84100 30.44530 963.83 -20.57 GL11290768+3910229 172.28200 39.17303 711.21 -21.04 GL11293907+3400049 172.41280 34.00138 737.90 -21.07 GL11302940+3824033 172.62250 38.40094 746.91 -21.27 GL11310072+3822434 172.75300 38.37873 859.01 -21.37 GL11314319+3821127 172.93000 38.35353 851.14 -21.12 GL11323584+4039261 173.14935 40.65727 1101.99 -21.60 GL11331964+3906123 173.33186 39.10343 1056.82 -21.49 GL11334767+4041113 173.44865 40.68650 1101.54 -20.70 GL11343523+3956143 173.64682 39.93732 1472.31 -20.92 GL11353180+4042553 173.88252 40.71538 955.04 -21.27 GL11364518+3818560 174.18829 38.31558 1127.20 -21.66 GL11371272+3653096 174.30300 36.88600 827.94 -21.01 //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 27214 SUBJECT: LIGO/Virgo S200219ac: Updated Sky Localization DATE: 20/02/25 23:13:32 GMT FROM: Leo Singer at GSFC The LIGO Scientific Collaboration and the Virgo Collaboration report: We have conducted further analysis of the LIGO Hanford Observatory (H1), LIGO Livingston Observatory (L1), and Virgo Observatory (V1) data around the time of the compact binary merger (CBC) candidate S200219ac (GCN Circular 27130). Parameter estimation has been performed using LALInference [1] and a new sky map, LALInference.fits.gz,0, distributed via GCN Notice, is available for retrieval from the GraceDB event page: https://gracedb.ligo.org/superevents/S200219ac The preferred sky map at this time is LALInference.fits.gz,0. For the LALInference.fits.gz,0 sky map, the 90% credible region is 781 deg2. Marginalized over the whole sky, the a posteriori luminosity distance estimate is 3533 +/- 1031 Mpc (a posteriori mean +/- standard deviation). For further information about analysis methodology and the contents of this alert, refer to the LIGO/Virgo Public Alerts User Guide . [1] Veitch et al. PRD 91, 042003 (2015) //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 27225 SUBJECT: LIGO/Virgo S200219ac: Upper limits from Konus-Wind observations DATE: 20/02/26 15:02:36 GMT FROM: Anna Ridnaia at Ioffe Institute A. Ridnaia, S. Golenetskii, R.Aptekar, D. Frederiks, M. Ulanov, D. Svinkin, A. Tsvetkova, A. Lysenko, and T. Cline, on behalf of the Konus-Wind team, report: Konus-Wind (KW) was observing the whole sky at the time of the LIGO/Virgo event S200219ac (2020-02-19 09:44:15.195 UTC, hereafter T0; LIGO/Virgo Collaboration GCN Circ. 27130). No triggered KW GRBs happened between ~2 hours before and ~10 minutes after T0. The burst localizations are inconsistent with the S200219ac. Using waiting-mode data within the interval T0 +/- 100 s, we found no significant (> 5 sigma) excess over the background in both KW detectors on temporal scales from 2.944 s to 100 s. We estimate an upper limit (90% conf.) on the 20 - 1500 keV fluence to 1.0x10^-6 erg/cm^2 for a burst lasting less than 2.944 s and having a typical KW short GRB spectrum (an exponentially cut off power law with alpha =-0.5 and Ep=500 keV). For a typical long GRB spectrum (the Band function with alpha=-1, beta=-2.5, and Ep=300 keV), the corresponding limiting peak flux is 2.4x10^-7 erg/cm^2/s (20 - 1500 keV, 2.944 s scale). All the quoted values are preliminary. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 27281 SUBJECT: LIGO/Virgo S200219ac: AstroSat CZTI upper limits DATE: 20/03/02 06:36:18 GMT FROM: Varun Bhalerao at Indian Inst of Tech V. Shenoy (IITB), Aarthy E. (PRL), V. Bhalerao (IITB), D. Bhattacharya (IUCAA), A. R. Rao (TIFR), S. Vadawale (PRL) report on behalf of the AstroSat CZTI collaboration: We have carried a search for X-ray candidates in Astrosat CZTI data in a 100 sec window around the trigger time of the BBH Merger event S200219ac (UTC 2020-02-19 09:44:15, GraceDB event). We use the LALInference.fits.gz,1 map (https://gracedb.ligo.org/api/superevents/S200219ac/files/LALInference.fits.gz,1) for our analysis. CZTI is a coded aperture mask instrument that has considerable effective area for about 29% of the entire sky, but is also sensitive to brighter transients from the entire sky. At the time of the merger, Astrosat's nominal pointing is RA,DEC = 14:17:44.8, -13:03:26.8 (214.4367,-13.0574), which is ~138 deg away from the maximum probability location. At the time of the merger event, the Earth-satellite-transient angle corresponding to maximum probability location is ~56 deg and hence is occulted by Earth in satellite's frame. In a time interval of 100 sec around the event, the region of the localisation map which is not occulted by Earth in the satellite's frame has a cumulative probability of 0.54 (54%). CZTI data were de-trended to remove orbit-wise background variation. We then searched data from the four independent, identical quadrants to look for coincident spikes in the count rates. Searches were undertaken by binning the data in 0.1s, 1s, and 10s respectively. Statistical fluctuations in background count rates were estimated by using data from 10 (+-5) neighbouring orbits. We selected confidence levels such that the probability of a false trigger in a 1000 sec window is 10^-4. We do not find any evidence for any hard X-ray transient in this window, in the CZTI energy range of 20-200 keV. We use a detailed mass model of the satellite to calculate the direction-dependent instrument response for points in the visible sky. We then assume the source is modelled as a power law with photon index alpha = -1, and convert our count rate upper limits to direction-dependent flux limits. We obtain the following upper limits for source flux in the 20-200 keV band by taking a probability weighted mean over the visible sky: 0.1 s: flux limit= 6.09e-06 ergs/cm^2/s; fluence limit = 6.09e-07 ergs/cm^2 1.0 s: flux limit= 1.76e-06 ergs/cm^2/s; fluence limit = 1.76e-06 ergs/cm^2 10.0 s: flux limit= 2.66e-07 ergs/cm^2/s; fluence limit = 2.66e-06 ergs/cm^2 CZTI is built by a TIFR-led consortium of institutes across India, including VSSC, ISAC, IUCAA, SAC and PRL. The Indian Space Research Organisation funded, managed and facilitated the project.